CN110346958A - Electrochromism fiber device and preparation method based on multistable cholesteryl liquid crystal - Google Patents
Electrochromism fiber device and preparation method based on multistable cholesteryl liquid crystal Download PDFInfo
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- CN110346958A CN110346958A CN201910572467.6A CN201910572467A CN110346958A CN 110346958 A CN110346958 A CN 110346958A CN 201910572467 A CN201910572467 A CN 201910572467A CN 110346958 A CN110346958 A CN 110346958A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1339—Gaskets; Spacers; Sealing of cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/1514—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/153—Constructional details
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/153—Constructional details
- G02F1/155—Electrodes
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/153—Constructional details
- G02F1/161—Gaskets; Spacers; Sealing of cells; Filling or closing of cells
Abstract
The invention discloses a kind of electrochromism fiber devices and preparation method based on multistable cholesteryl liquid crystal, device includes the array combination of multiple liquid crystal fibers, each liquid crystal fiber includes surrounding layer and introns, interior electrode and cholesteric liquid crystal material inside surrounding layer, and the surrounding layer and interior electrode are concentric column；The introns are arranged between surrounding layer and interior electrode, adjacent with the lateral surface of the medial surface of surrounding layer and interior electrode respectively；Area filling between surrounding layer and interior electrode in addition to introns has cholesteric liquid crystal material.The present invention uses the electrochromism fiber based on cholesteric cholesteric liquid crystal material, and driving voltage is stablized, and facilitates processing.Temperature induced color changing and photochromic liquid crystal fiber are substantially better than in terms of controllability, stability and adaptation；Electrochromism fiber based on cholesteric cholesteric liquid crystal material has good controllability and multistable state property, will there is huge application advantage in terms of liquid crystal color-changing.
Description
Technical field
The invention belongs to liquid crystal color-changing technical field, in particular to a kind of electrochromism based on multistable cholesteryl liquid crystal
Fiber device and preparation method.
Background technique
The orientation of liquid crystal molecule can change under the action of external force field (such as: temperature, electric field or illumination), to lead
Cause change of the material to the refractive index of light；Cholesteryl liquid crystal is exactly to utilize its unique helical molecular arrangement, is realized to incidence
The Bragg reflection of light shows gorgeous color under visible light.Due to unique helical structure, cholesteryl liquid crystal can be real
Now very distinct color displays, and screw pitch is very sensitive to temperature, when screw pitch is suitable with the wavelength of light, just generation is strong has
The reflection of selectivity.In the sunlight, with the raising of temperature, the color of cholesteryl liquid crystal by red, orange, yellow, green, blue, indigo, purple it is suitable
Sequence variation, when the temperature drops, discoloration sequence on the contrary, and have high sensitivity, can be shown in less than the temperature difference once whole
A chromatography.At present for the discoloration application of cholesteryl liquid crystal, what is mainly utilized is its thermal sensitivity；It can make metal detector, and
It diagnoses the illness, detects tumour；Its primary limitation is the switching of color dependent on environment temperature, poor controllability.
For cholesteryl liquid crystal, maximum feature is exactly its bistable characteristic: cholesteryl liquid crystal is suitably being surface-treated
Or there is null field bistable characteristic: planar texture (P state) after addition polymer, conical texture (FC state): extra electric field is to centainly
It maintains electric field constant when degree, is transparent state (H state).Wherein there are larger energy barriers between H state and FC state, apply different pulses
Voltage keeps liquid crystal molecule institute capacitation amount different.When extra electric field makes liquid crystal molecule cross arrangement energy barrier, Liquid Crystal Molecules Alignment
Regular is P state (molecular energy is minimum), and state is constant after removing electric field: when extra electric field is insufficient to allow liquid crystal molecule to cross this
When potential barrier, Liquid Crystal Molecules Alignment is FC state in a jumble, and state is constant after removing electric field.When extra electric field is more than threshold field and is maintained
When constant, Liquid Crystal Molecules Alignment is H state.In an experiment, when applied voltage makes cholesteryl liquid crystal reach transparent state, if quickly removing
Fall applied voltage, then cholesteryl liquid crystal returns to plane state (display Bragg reflection color)；If slowly removing applied voltage, cholesteric
Type liquid crystal can be stablized at Focal conic state (without color, reflectivity is almost nil), and here it is the null field bistable state of cholesteryl liquid crystal is special
Property.
There are many color changing structures based on cholesteric liquid crystal material, and such as nematic electrochromism liquid crystal, blue phase is photochromic
Liquid crystal, cholesteric thermo-varing liquid crystal etc..But the Electrocontrolled color change method based on one dimension fibre structure and cholesteric liquid crystal material
And it is few, application No. is the patent Shens of 201711404875.8 (a kind of titles: preparation method of temperature response type liquid crystal fiber)
The preparation method that please disclose a kind of temperature response type liquid crystal fiber is passed through using liquid crystal microcapsule as temperature-responsive material
Electrostatic spinning technique preparation temperature response type liquid crystal fiber, the liquid crystal fiber of preparation can variation with temperature and reality is different
Color, but be that the liquid crystal fiber arrangement for preparing is mixed and disorderly unordered the shortcomings that the invention, it not can be mass, and external temperature controls
It is relatively difficult, it adapts to scene and compares limitation.
Fibre technology based on cholesteric liquid crystal material filling has had extensive research, is concentrated mainly on tunable
Photonic crystal, light field scheme control, sensing etc..Such as: photonic crystal fiber PCF (microstructured optical fibers MOF), liquid crystal photon
Band gap fiber, liquid crystal temperature sensor, micro-structural polymer optical fiber (mPOF), the structures such as liquid crystal cylindrical waveguide.
The research of fiber device of cholesteric liquid crystal filling is not much at present, and is essentially all temperature control response and light-operated
The device of response.The cholesteryl liquid crystal that dyestuff (fluorescent dye DCM) adulterates in Lv Lelan seminar, Harbin Engineering University injects
To in Hollow-Core Photonic Crystal Fibers (5 μm of core diameter), by the way that temperature is risen to 50 DEG C from 25 DEG C, tunable spectral bandwidth range
Increase to 267.93nm (exponentially form rapid growth) from 173.76nm, and simultaneously, temperature is higher, liquid crystal equivalent refractive index is got over
Greatly, fiber transmission attenuation is bigger, and light intensity amplification factor dies down.Realize the intensity and bandwidth of optical fiber fluorescence light source and image intensifer
Regulate and control feasible.Its major defect is: light source center wavelength is limited by clearing point cannot cover entire visible light wave range, color
Display effect is poor, and device regulation is too strong to the dependence of temperature, and stability is poor.
Cholesteric liquid crystal material is injected into capillary (size is at 60 μm) by Yu Yanlei seminar, Fudan University, is passed through
Blue is tuned as green by the light irradiation (80mW/cm2) of 530nm, and red (time 23s) is arrived in then green tuning again, is passed through
Red is tuned as green by the light irradiation (40mW/cm2) of 470nm, and blue (time 14s) is arrived in then green tuning again, is realized
The color response of cholesteric liquid crystal material photochromic fibre.Its major defect is: light source difficulty control, it is difficult to realize desired color
Control accurate, and be not suitable for working in visible-range, stability and controllability are poor.
Summary of the invention
The electricity based on cholesteric liquid crystal material is used it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of
Mutagens color fibre, driving voltage is stablized, and facilitates processing, has good controllability and multistable state property, in terms of liquid crystal color-changing
To there are the electrochromism fiber device and preparation method based on multistable cholesteryl liquid crystal of huge application advantage.
The purpose of the present invention is achieved through the following technical solutions: a kind of based on multistable cholesteric liquid crystal material
Electrochromism fiber device, the array combination including multiple liquid crystal fibers, each liquid crystal fiber include surrounding layer and be located at outsourcing
Introns, interior electrode and cholesteric liquid crystal material inside layer, the surrounding layer and interior electrode are concentric column；The introns
Including multiple, introns be arranged between surrounding layer and interior electrode, introns are sphere structure, respectively with the inside of surrounding layer
The lateral surface of face and interior electrode is adjacent；Area filling between surrounding layer and interior electrode in addition to introns has cholesteryl liquid crystal
Material.
Further, in the array combination of the liquid crystal fiber, multiple liquid crystal fibers in the way of polygonal arrangement into
Row combination.
Further, each liquid crystal fiber uses identical cholesteric liquid crystal material.
Further, each liquid crystal fiber uses different cholesteric liquid crystal materials.
The surrounding layer is made of transparent conductive material, the external electrode as electrochromism fiber device；Surrounding layer is adopted
It is made of the epoxide resin polymer of ITO, PEDOT or doping nano-Ag.
A kind of electrochromism fiber device preparation method based on multistable cholesteric liquid crystal material, comprising the following steps:
Electrode in S1, preparation, select electrode prefabricated rods, one layer of graphene is uniformly coated outside electrode prefabricated rods, then into
Row heat cure；
S2, the spherical introns of one layer of uniformly coating are rotated outside electrode bar；
S3, surrounding layer is prepared, transparent conductive material is prepared into two identical hollow semi-cylinders body sticks；
S4, the interior electrode of coated introns is placed between two semicylinder sticks, then by two semicolumn sticks
It is spliced into a complete cylindrical body；
S5, irrigation crystal operation is carried out, pours into cholesteric liquid crystal material in the cylindrical body obtained to step S4, makes cholesteryl liquid crystal
Material obtains liquid crystal fiber full of the region between surrounding layer and interior electrode in addition to introns；
S6, annealing operation is carried out to the liquid crystal fiber that step S5 is obtained: liquid crystal fiber is heated up 30 DEG C using every 20min
Heating rate is warming up to 50 DEG C from 20 DEG C；Then it keeps the temperature 30min at 50 DEG C, then is cooled down 30 DEG C of rate of temperature fall with every 60min
Liquid crystal fiber is cooled to 20 DEG C；
S7, polishing grinding processing is carried out to liquid crystal fiber surface；
S8, multiple liquid crystal fibers are combined into a manner of polygonal arrangement to fibre bundle, form electrochromism fiber device.
The beneficial effects of the present invention are:
(1) electrochromism fiber prepared by the present invention based on cholesteric liquid crystal material can be shown with the variation of voltage
Different color out has the characteristics of in bright gay color, high sensitivity, and the production efficiency is high, is produced on a large scale；
(2) electrochromism fiber based on cholesteric liquid crystal material is used, driving voltage is stablized, and facilitates processing.Can
Control property, stability and adaptation environment etc. are substantially better than temperature induced color changing and photochromic liquid crystal fiber；
(3) electrochromism fiber based on cholesteric liquid crystal material has good controllability and multistable state property, in liquid crystal
Discoloration aspect will have huge application advantage.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the electrochromism fiber device of the invention based on multistable cholesteric liquid crystal material；
Fig. 2 is that the cross section of the electrochromism fiber device of the invention based on multistable cholesteric liquid crystal material is illustrated
Figure；
Description of symbols: 1- surrounding layer, 2- introns, electrode in 3-, 4- cholesteric liquid crystal material.
Specific embodiment
Technical solution of the present invention is further illustrated with reference to the accompanying drawing.
As shown in Figure 1, a kind of electrochromism fiber device based on multistable cholesteric liquid crystal material, including multiple liquid crystal
The array combination of fiber, each liquid crystal fiber include surrounding layer 1 and introns 2, interior electrode 3 and gallbladder inside surrounding layer 1
Steroid type liquid crystal material 4, the surrounding layer 1 and interior electrode 3 are concentric column；The introns 2 include multiple, the setting of introns 2
Between surrounding layer 1 and interior electrode 3, introns 2 are sphere structure, outer with the medial surface of surrounding layer 1 and interior electrode 3 respectively
Side is adjacent (to be used the setting of three introns, is located at the position in the middle part of surrounding layer 1 and interior electrode, and uniformly divide in Fig. 1
Cloth is in an annular between surrounding layer 1 and interior electrode 3, as the support between internal and external electrode)；In surrounding layer 1 and interior electrode 3
Between area filling in addition to introns 2 have cholesteric liquid crystal material 4.
The electrochromism fiber device discoloration driving voltage of the present embodiment is 15V or so.Wherein, fiber cholesteryl liquid crystal material
Material is that a kind of nematic crystal XH1100 adulterates the chiral agent S811 of a certain concentration (22%) as cholesteric liquid crystal material, interior electricity
Pole 3 be 304 stainless steel wires, a diameter of 400 μm；Intermediate liquid crystal area internal diameter is 50 μm, and the size of introns is 50 μm of diameter, and
To be symmetrical, the internal diameter of fiber surrounding layer is 600 μm, with a thickness of 20 μm.
Further, the metal electrode (interior electrode) uses the wire of well conducting, and will be at metallic walls nigrescence
Dark color is managed into improve contrast, the wire can be stainless steel wire, copper wire or tungsten wire etc., and diameter is in micron to millimeter
Between, toughness is preferable, and at low cost, is easy to draw altogether with fiber.
Further, the surrounding layer 1 is made of transparent conductive material, the dispatch from foreign news agency as electrochromism fiber device
Pole；Surrounding layer 1 is made of the epoxide resin polymer of ITO, PEDOT or doping nano-Ag, and the size of surrounding layer is several hundred micro-
Rice magnitude.
Introns can be possessed between the automatically controlled multistable color-changing liquid crystal fiber internal and external electrode as support, the number of introns
Mesh includes but is not limited to two, three, four etc., and the shape of introns is usually spherical.
The cholesteric liquid crystal material of the difference chiral agent concentration refer under identical voltage driving show different colours or
It is that driving shows identical color under different voltages, identical cholesteric liquid crystal material can be used, difference also can be used
Cholesteric liquid crystal material.As shown in Fig. 2, for liquid crystal fiber prepared by the present invention (three fiber combinations, three interval minor structures)
Array combination structure sectional view, 1 is the surrounding layer of fiber, and 2 be spherical introns, and 3 be interior electrode, is filled in three fibers
Be different characteristics cholesteric liquid crystal material., it is apparent that the screw pitch of 3 kinds of cholesteric liquid crystal materials is different.
Used cholesteryl liquid crystal is to mix chiral agent by nematic crystal to prepare, and different chiral agents is corresponding
Helical twisting power it is also different, the concentration of chiral agent needed for same Bragg reflection color is also different.The cholesteryl liquid crystal
Bragg reflection color can be adjusted by the concentration and material for adjusting chiral agent.
The selection of chirality agent material used:
| Chiral agent material | CN | CB15 | S811 | R1011 |
| Distortion power HTP (μm-1) | 5.2 | 7.9 | 10.1 | 28.2 |
| Rotation direction | It is left-handed | It is left-handed | It is left-handed | Dextrorotation |
From the point of view of to sum up, the distortion power of S811 is (the same Bragg reflection color institute of best one in all left-handed chiral agents
The concentration of the chiral agent needed is minimum), so the chiral agent material using S811 as this experiment.
The voltage of the realization stable state can also be adjusted by changing frequency；It is not only by what electric field may be implemented
Multistable (different reflectivity of same color) also may be implemented in bistable state.
Further, in the array combination of the liquid crystal fiber, multiple liquid crystal fibers in the way of polygonal arrangement into
Row combination.
A kind of electrochromism fiber device preparation method based on multistable cholesteric liquid crystal material, comprising the following steps:
Electrode in S1, preparation selects electrode prefabricated rods (diameter is 400 μm), one layer is uniformly coated outside electrode prefabricated rods
Then graphene carries out heat cure；Inner electrode size includes but is not limited to micron-scale, and interior electrode surface is graphene coated
Solidification, is in order to obtain better color contrast electrode blacking, to realize better liquid crystal display effect；
S2, the spherical introns of one layer of uniformly coating are rotated outside electrode bar；Selected introns size is exactly final electricity
The thickness of liquid crystal in mutagens color fibre device, the diameter of the present embodiment introns are 50 μm；Selected introns concentration determines
The duty ratio of liquid crystal in final Electrocontrolled color change liquid crystal fiber structure；During spraying introns, electrode bar while uniform rotation,
To guarantee that distribution of the introns on electrode bar is uniform.
S3, surrounding layer is prepared, by the transparent conductive material (polymerization of epoxy resins including ITO, PEDOT or doping nano-Ag
The materials such as object) it is prepared into two identical hollow semi-cylinders body sticks；The internal diameter of hollow semi-cylinders body stick is 600 μm, with a thickness of
20μm；The transparency of fiber surrounding layer determines the final color rendering effect of liquid crystal, so transparency is as high as possible；Fiber
Surrounding layer will have certain haze value, keep the final color displays of liquid crystal more soft, have broader angular spectrum；To fiber
The major requirement of surrounding layer electric conductivity is homogeneity, and to realize the homogeneity of liquid crystal area electric field, it is preferably radial to reach liquid crystal area
Field homogeneity effect.
S4, the interior electrode of coated introns is placed between two semicylinder sticks, then by two semicolumn sticks
It is spliced into a complete cylindrical body, no gap is required between surrounding layer and introns, is fitted closely.
S5, irrigation crystal operation is carried out, pours into cholesteric liquid crystal material in the cylindrical body obtained to step S4, makes cholesteryl liquid crystal
Material obtains liquid crystal fiber full of the region between surrounding layer and interior electrode in addition to introns；Heat can be used in irrigation crystal operation
The methods of irrigation crystal method, vacuum irrigation crystal method, since the device size of the present embodiment is smaller, so in such a way that vacuum pump vacuumizes
Irrigation crystal is carried out, better volume irrigation crystal effect can be obtained.
S6, annealing operation is carried out to the liquid crystal fiber that step S5 is obtained: liquid crystal fiber is heated up 30 DEG C using every 20min
Heating rate is warming up to 50 DEG C from 20 DEG C；Then it keeps the temperature 30min at 50 DEG C, then is cooled down 30 DEG C of rate of temperature fall with every 60min
Liquid crystal fiber is cooled to 20 DEG C；
S7, polishing grinding processing is carried out to liquid crystal fiber surface；
S8, by multiple liquid crystal fibers, (different liquid crystal fibers uses different cholesteric liquid crystal materials, then its Prague is anti-
It is identical to penetrate color, but reflectivity is different) fibre bundle is combined into a manner of polygonal arrangement, electrochromism fiber device is formed, is led to
Overvoltage controls 0/1 on-off, may be implemented 2nKind steady state effect.
After the completion of irrigation crystal, fiber display color is plane state at this time (fiber takes on a red color)；With the frequency of 1kHz, the electricity of 12V
The AC field of pressure drives, and liquid crystal reaches Focal conic state (fiber is in black) in fiber, and when voltage is increased to 50V, liquid crystal is nematic
State (fiber is still in black), at this point, liquid crystal can be stablized Focal conic state if slowly removing voltage (fiber is stablized in black)；If fast
Speed removes voltage, and liquid crystal can return to plane state (fiber returns to red), and both of which is the stable state of zero point off field (in 0-
Between 12V, the Color Reflectance of fiber can be reduced with the increase of voltage, and the two is substantially negatively correlated relationship, still
In this voltage range, the color of fiber is basic or red, and only degree is different.So can be in the range of 0-12V, benefit
It is driven with different voltage, realizes red different reflectivity).A red reflectivity may be implemented in a fiber as a result,
The bistable switching of zero electric field of R1 and black；But the array combination unit that three fibers (three reflectivity) are constituted can
To realize 8 stable states and the multistable electrically-controlled liquid crystal color-changing unit device of fiber state with free switching, can be realized.
The realization of multistable combination:
N kind is inoculated with to the fibre of the cholesteric liquid crystal material (Bragg reflection color is identical, but reflectivity is different) of different characteristics
Dimension is combined into fibre bundle in a manner of the arrangement of the side n shape, forms an array structure unit, and each fiber may be implemented two kinds surely
State (the reflectivity R1 and black of certain Bragg reflection color), n root fiber is the n kind reflectivity of this color respectively, with array
Mode combine, so that it may realize 2nKind steady state effect.
Circuit control explanation:
The circuit control of every fiber all mainly divides two states, and when needing color to be shown is black, needing will be electric
Pressure is given to the threshold voltage of corresponding cholesteric liquid crystal material (that is, the electricity for making cholesteric phase cholesteric liquid crystal material be in nematic state
Pressure), then slowly reduce voltage until no-voltage (that is, cholesteric phase cholesteric liquid crystal material can stablize the process in Focal conic state),
Liquid crystal fiber can be stablized in black；When need color to be shown Bragg reflection color corresponding for cholesteric liquid crystal material, need
Voltage is given to the threshold voltage of corresponding cholesteric liquid crystal material (that is, cholesteric phase cholesteric liquid crystal material is made to be in nematic state
Voltage), then quickly reduce voltage to no-voltage (that is, cholesteric phase cholesteric liquid crystal material can transform back into plane from Focal conic state
The process of state), liquid crystal fiber eventually shows and stablizes in its corresponding Bragg reflection color.
For the fiber array of different cholesteric liquid crystal material (Bragg reflection color is identical, but reflectivity is different) fillings
Combination, it should give identical AC field driving (voltage is identical with frequency)；
For the fiber array of identical cholesteric liquid crystal material (Bragg reflection color is identical, but reflectivity is different) filling
Combination, it should give different AC field drivings (voltage and frequency difference).
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.This field
Those of ordinary skill disclosed the technical disclosures can make according to the present invention and various not depart from the other each of essence of the invention
The specific variations and combinations of kind, these variations and combinations are still within the scope of the present invention.
Claims (6)
1. a kind of electrochromism fiber device based on multistable cholesteryl liquid crystal, which is characterized in that including multiple liquid crystal fibers
Array combination, each liquid crystal fiber includes surrounding layer (1) and is located at surrounding layer (1) internal introns (2), interior electrode (3)
With cholesteric liquid crystal material (4), the surrounding layer (1) and interior electrode (3) are concentric column；The introns (2) include it is multiple,
Introns (2) be arranged between surrounding layer (1) and interior electrode (3), introns (2) be sphere structure, respectively with surrounding layer (1)
Medial surface and interior electrode (3) lateral surface it is adjacent；Area between surrounding layer (1) and interior electrode (3) in addition to introns (2)
Domain is filled with cholesteric liquid crystal material (4).
2. a kind of electrochromism fiber device based on multistable cholesteryl liquid crystal according to claim 1, feature exist
In in the array combination of the liquid crystal fiber, multiple liquid crystal fibers are combined in the way of polygonal arrangement.
3. a kind of electrochromism fiber device based on multistable cholesteryl liquid crystal according to claim 1, feature exist
In each liquid crystal fiber uses identical cholesteric liquid crystal material.
4. a kind of electrochromism fiber device based on multistable cholesteryl liquid crystal according to claim 1, feature exist
In each liquid crystal fiber uses different cholesteric liquid crystal materials.
5. a kind of electrochromism fiber device based on multistable cholesteryl liquid crystal according to claim 1, feature exist
In the surrounding layer (1) is made of transparent conductive material, the external electrode as electrochromism fiber device；Surrounding layer (1) is adopted
It is made of the epoxide resin polymer of ITO, PEDOT or doping nano-Ag.
6. a kind of electrochromism fiber device preparation method based on multistable cholesteryl liquid crystal, which is characterized in that including following
Step:
Electrode in S1, preparation selects electrode prefabricated rods, one layer of graphene is uniformly coated outside electrode prefabricated rods, then carries out heat
Solidification；
S2, the spherical introns of one layer of uniformly coating are rotated outside electrode bar；
S3, surrounding layer is prepared, transparent conductive material is prepared into two identical hollow semi-cylinders body sticks；
S4, the interior electrode of coated introns is placed between two semicylinder sticks, then splices two semicolumn sticks
The complete cylindrical body of Cheng Yigen；
S5, irrigation crystal operation is carried out, pours into cholesteric liquid crystal material in the cylindrical body obtained to step S4, makes cholesteric liquid crystal material
Full of the region between surrounding layer and interior electrode in addition to introns, liquid crystal fiber is obtained；
S6, annealing operation is carried out to the liquid crystal fiber that step S5 is obtained: liquid crystal fiber is used to the heating of 30 DEG C of every 20min heating
Rate is warming up to 50 DEG C from 20 DEG C；Then it keeps the temperature 30min at 50 DEG C, then cools down 30 DEG C of rate of temperature fall for liquid with every 60min
Crystal fiber is cooled to 20 DEG C；
S7, polishing grinding processing is carried out to liquid crystal fiber surface；
S8, multiple liquid crystal fibers are combined into a manner of polygonal arrangement to fibre bundle, form electrochromism fiber device.
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| CN112267174A (en) * | 2020-10-26 | 2021-01-26 | 江南大学 | Method for preparing electrochromic fiber without external electrode by coaxial microfluid spinning method |
| CN113862823A (en) * | 2021-09-09 | 2021-12-31 | 江南大学 | Bamboo joint-like liquid crystal fiber and preparation method thereof |
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